Synthesis and characterization of the leaf-like Cu2O/CuO mixed phase nanosheets array

2019 ◽  
Vol 33 (36) ◽  
pp. 1950461 ◽  
Author(s):  
Yan Qi ◽  
Bingqian Bi ◽  
Yilin Yan ◽  
Lecheng Tian
Keyword(s):  
Near Infrared ◽  
Wavelength Region ◽  
Infrared Region ◽  
Mixed Phase ◽  
Synthesis And Characterization ◽  
Average Height ◽  
Xps Analysis ◽  
Sem Images ◽  
Near Infrared Region

In this study, a leaf-like [Formula: see text] mixed phase nanosheets array was successfully prepared by anodization. XRD, EDS, and XPS analysis confirmed the formation of [Formula: see text] mixed phase nanostructures. SEM images indicate that the fabricated [Formula: see text] mixed phase nanosheets almost grow vertically on the substrate. The average height of nanosheets is approximately 500 nm. The optical absorption of the mixed phase covers the entire wavelength region of visible light and a little part of the near-infrared region of short wavelength.

Darstellung, spektroskopische und elektrochemische Charakterisierung von Pentachloromonocarbonylosmat(IV), [OsCl5(CO)]- / Preparation, Spectroscopical and Electrochemical Characterization of Pentachlorom onocarbonylosm ate(IV), [OsCl5(CO)]-

1986 ◽  
Vol 41 (1) ◽  
pp. 25-31 ◽  
Author(s):  
M. Bruns ◽  
W. Preetz
Keyword(s):  
Near Infrared ◽  
Point Group ◽  
Visible Region ◽  
Infrared Region ◽  
Isotopic Substitution ◽  
Standard Potential ◽  
Racah Parameter ◽  
Charge Transfer Transitions ◽  
Near Infrared Region

The first carbonyl compound of quadrivalent osmium [OsCl5(CO)]- is prepared by chlorination of trans-[OsX4(CO)2]- (X = Br, I) dissolved in CH2Cl2. It is reduced immediately by Br- and I- to give [OsCl5(CO)]2-. The standard potential [OsCl5(CO)]-/ [OsCl5(CO)]2- in acetonitrile referred to the saturated mercury-mercurous sulphate electrode is 0.623 V. The IR and Ra bands of [OsCl5(CO)]- are assigned according to point group C4v. Compared with the corresponding Os(III) complex there is a shift to higher frequencies of ν(CO) and ν(OsCI) of about 170 and 25 cm-1, whereas ν(OsC) and δ(OsCO) are lowered by 158 and 110cm-1, respectively. The electronic absorption spectrum shows six d - d bands coupled with vibrations in the near infrared region. The O - O transitions are calculated from the vibrational fine structure, taking into consideration shifts by 13C isotopic substitution. The lowest levels are confirmed by peaks in the electronic Raman spectrum. From the estimated Racah parameter B = 280 cm-1 the low nephelauxetic ratio β55 = 0.41 is deduced indicating the high covalency in [OsCl5(CO)]-. Owing to the strong oxidizing character of Os(IV) the intensive charge transfer transitions in the visible region are shifted bathochromicly by about 4000 cm1 in relation to corresponding bands of [OsCl5(CO)]2-.

A New Bi-substituted Rare-earth Iron Garnet for a Wideband and Temperature-stabilized Optical Isolator

2000 ◽  
Vol 15 (8) ◽  
pp. 1665-1668 ◽  
Author(s):  
Min Huang ◽  
Sho Zhang
Keyword(s):  
Faraday Rotation ◽  
Near Infrared ◽  
Wavelength Region ◽  
Infrared Region ◽  
Faraday Rotator ◽  
Absorption Loss ◽  
Infrared Wavelength ◽  
Optical Isolator ◽  
Near Infrared Region ◽  
Iron Garnet

A wideband and temperature-stabilized optical isolator for 1.55-μm wavelength was developed using a new Bi-substituted holmium–ytterbium ion garnet (HoYbBiIG) single crystal as a Faraday rotator. The optical isolator features 0.34-μm bandwidth, less 0.6 dB insertion loss and over 37 dB backward loss at a wavelength of (1.55 ± 0.17) μm throughout the temperature range from −10 to 60 °C. The Faraday rotation and optical absorption loss of HoYbBiIG were investigated in the near-infrared wavelength region (λ = 0.9 to 1.7 μm). The specific Faraday rotation of Ho0.85Yb1.02Bi1.13Fe5O12 is about −767°/cm at λ = 1.55 μm. The Faraday rotation wavelength and temperature characteristics of HoYbBiIG crystals are also discussed. These results indicate that the Bi-substituted holmium–ytterbium iron garnet single crystals realize a high Faraday rotation stability against temperature and wavelength in the near-infrared region.

Effects of Water on the Spectra of Model Compounds in the Short-Wavelength near Infrared Spectral Region (14,000–9091 cm−1 or 714–1100 nm)

1994 ◽  
Vol 2 (4) ◽  
pp. 199-212 ◽  
Author(s):  
James B. Reeves
Keyword(s):  
Spectral Region ◽  
Short Wavelength ◽  
Near Infrared ◽  
Wavelength Region ◽  
Infrared Region ◽  
Organic Liquids ◽  
Model Compounds ◽  
Water Solutions ◽  
Long Wavelength ◽  
Near Infrared Region

The spectral region from 14,000 to 9091 cm−1 (714–1100 nm) is increasingly being investigated for the analysis of high moisture systems due to its low absorption by water. The objective of this work was to determine if the effects of water on model compounds seen in the 7140–4000 cm−1 (1400–2500 nm) near infrared region occurred in this short wavelength region. Spectra were obtained by diffuse reflectance and transmission using a Fourier transform spectrometer. Spectra were obtained for a variety of organic liquids, liquid/water solutions, solids, wet solids and solutions of solids in water. Solutions included ethanol, acetic acid, acetone, pyridine, sugars, starch, cellulose, gums, amino acids and proteins. The spectral results showed that the effects seen in the 7140–4000 cm−1 (1400–2500 nm) region were also common in the 14,000–9091 cm−1 (714–1100 nm) region (i.e. peak shifts, loss of spectral features etc.). For example, in the long wavelength near infrared region, sugars, such as sucrose and glucose, were distinctively different as crystalline solids, but very similar in solution. In addition, molten glucose and urea appeared virtually identical to their dissolved counterparts indicating a loss of crystallinity to be the source of the changes. Finally, changes in the spectra of other materials, such as acetone, n-butylamine and ethanol (while similar in nature to those previously found in the near infrared) were not identical. Thus, while some shifts in peaks were found to occur with acetone/water mixtures, the dominant effects were changes in the relative intensities of peaks within the acetone spectrum, something not seen in the long wavelength region. Therefore, while the type of spectral effects caused by the presence of water may be similar across various spectral regions, the degree and exact nature of those effects vary with the material in question, the amount of water present and the region in question. Thus, the choice of the spectral region to be used for a specific problem should consider the materials in question, as well as other factors such as the usable pathlength.

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